Glistening Oil is a rare Enchantment — Aura card from New Phyrexia (NPH), collector number 62. Current market price: $12.53 (foil $49.03), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature has infect. At the beginning of your upkeep, put a -1/-1 counter on enchanted creature. When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.